Gemstone



FIG. 1 is a perspective view from the top of a gemstone according to the embodiment of the present design;

FIG. 2 is a bottom view of the embodiment;

FIG. 3 is a front view of the embodiment;

FIG. 4 is a left side view of the embodiment;

FIG. 5 is a top view of the embodiment;

FIG. 6 is a right side view of the embodiment; and,

FIG. 7 is a back view of the embodiment. 

I claim the ornamental design for a gemstone, as shown and described. 